[Solved] how do i exclude the answer to one question from the list of answers on the next question

I have a question where i am asking people what brands they know of a particular product. The first question is the first brand that comes to mind (un-aided). There is a list of brands that, once they mention top of mind, the interviewer can select the brand they mentioned. Here is where i need help. The next question is what other brands do you know. I want the list of brands that can be marked to exclude the brand they already metioned. How do I do this?